Fortune Below Mainline And Sabine/Corin Source Boundary

Status

This is an operating source-ownership boundary. It controls retrieval and planning scope; it does not promote provisional events into canon.

Mainline Books Two And Three

The mainline owns events that change the expedition, household, legal, financial, or publicly observable state of the ensemble. This includes:

Selka's folded-route investigation and professional authority.
Cerys's allocation, release, employment, belonging, and mainline relationship choices.
The estate, Hallow Street, route-office, equipment, and expedition arcs.
Sabine's rescue, legal release, independent alternatives, chosen return, paid work, and relationships with the household when those events are selected into an approved mainline book state.
Only the minimum externally observable Sabine/Corin continuity needed by another mainline scene.

The approved two-chapter Book Two pilot contains no Sabine/Corin side-novel event. Chapter 1 excludes the game entirely, and Chapter 2 concerns Cerys's freedom question.

Sabine/Corin Side Novel

The side novel owns the private progression of Sabine and Corin's relationship across the time occupied by Books Two and Three. This includes:

The game, turns, scores, rules, private experiments, and physical thresholds.
Private declarations, the sealed envelope, its handling, and its resolution.
The ten-turn manuscript, the preferred threshold sequence, alternate follow-ups, and rejected experiments.
Scene-level causes and consequences that are not independently visible to the mainline ensemble.

Mainline planning must not retrieve these materials. A side-novel event does not become a mainline fact merely because its chronology overlaps a mainline book.

Shared Continuity

Shared continuity must be deliberately copied into a reviewed bridge document. It is limited to public or externally observable resulting states, never private scene choreography.

Current provisional Book Two bridge candidates are:

Sabine and Corin begin a private game after Sabine is free and has chosen to remain at the estate.
Mainline scenes may show brief, unexplained evidence that the game continues.
The game remains unresolved at the end of the current provisional Book Two structure.

Potential Book Three bridge facts remain unapproved until the side-novel chronology and manuscript assembly are approved. Mainline work must not assume declarations, envelope resolution, physical completion, standing permission, or expected repetition.

Retrieval Rules

Mainline work may retrieve mainline sources and reviewed shared-continuity bridges.
Side-novel work may retrieve side-novel sources and reviewed shared-continuity bridges.
Neither work may retrieve the other work's planning, scenes, or manuscript drafts directly.
Series reference is reserved for genuinely shared world and established continuity material.
A document labelled provisional or planning cannot be registered with canon authority.
Mixed documents must be superseded and replaced by separately scoped documents rather than shared broadly.

Current Ownership Decisions

book-two-folded-route-restructure-plan.md belongs to mainline Book Two planning.
book-two-folded-route-pilot-2-chapters.json and its chapter briefs belong to mainline Book Two.
sabine-corin-side-book-30-chapter-plan.md belongs to side-novel planning.
Sabine/Corin scene menus, turn plans, private-scene drafts, the ten-turn manuscript, threshold prose, and optional follow-ups belong to the side novel.
The complete No Final Move experiment belongs to the side work as a noncanon experiment, not as a provisional mainline manuscript.
fortune-below-book-two-expanded-friendship-and-hallow-arcs.md is mixed legacy planning and must be superseded rather than used as a governing source by either work.
fortune-below-series-arc.md and fortune-below-restructure-canon.md identify themselves as planning and must not retain canon authority.

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